Capacitance-type material level indicator

Details Capacitance-type material level indicator Capacitance-type material level indicator

G - Physics

01

F

73/69, 73/0.5

G01F 23/26 (2006.01) G01F 25/00 (2006.01)

Patent

CA 1191716

Abstract of the Disclosure A system and probe for indicating the level of material in a vessel as a function of material capacitance comprising a resonant circuit including a capacitance probe adapted to be disposed in a vessel so as to be re- sponsive to variations in capacitance as a function of material level. An rf oscillator has an output coupled to the resonant circuit and to a phase detector for detect- ing variations in phase angle as a function of probe capac- itance. Level detection circuitry is responsive to an output of the phase detector and to a reference signal indicative of a predetermined level of material for indicat- ing material level as a function of a difference between capacitance at the probe and the reference signal. In the preferred embodiments of the invention disclosed, an auto- matic calibration circuit adjusts the resonance character istics of the parallel resonant circuit of the reference signal indicative of a predetermined reference material level.

432825

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